668782287866 has 96 divisors (see below), whose sum is σ = 1293256419840. Its totient is φ = 253761852960.

The previous prime is 668782287821. The next prime is 668782287923.

668782287866 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 668782287793 and 668782287802.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 25262945 + ... + 25289403.

It is an arithmetic number, because the mean of its divisors is an integer number (13471421040).

Almost surely, 2^668782287866 is an apocalyptic number.

668782287866 is a deficient number, since it is larger than the sum of its proper divisors (624474131974).

668782287866 is a wasteful number, since it uses less digits than its factorization.

668782287866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26880 (or 26869 counting only the distinct ones).

The product of its digits is 1040449536, while the sum is 74.

The spelling of 668782287866 in words is "six hundred sixty-eight billion, seven hundred eighty-two million, two hundred eighty-seven thousand, eight hundred sixty-six".